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RETIREMENT PLANS Tables (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2022
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage | 100.00% | 100.00% |
Defined Benefit Plan, Expected Future Benefit Payment, Next Twelve Months | $ 12 |  |
Defined Benefit Plan, Expected Future Benefit Payment, Year Two | 12 |  |
Defined Benefit Plan, Expected Future Benefit Payment, Year Three | 12 |  |
Defined Benefit Plan, Expected Future Benefit Payment, Year Four | 13 |  |
Defined Benefit Plan, Expected Future Benefit Payment, Year Five | 13 |  |
Defined Benefit Plan, Expected Future Benefit Payment, Five Fiscal Years Thereafter | 66 |  |
Defined Benefit Plan, Plan Assets, Amount | 174 | $ 147 |
Cash refund (contribution) for the ERP settlement, net | 0 | 9 | $ (16)
(Gain) loss on settlement of the Esterline Retirement Plan (the “ERP”) | $ 0 | $ 9 | $ (22)
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) Excluding Service Cost, Statement of Income or Comprehensive Income [Extensible Enumeration] | Other Nonoperating Income (Expense) | Other Nonoperating Income (Expense) | Other Nonoperating Income (Expense)
Fair Value, Inputs, Level 1 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Plan Assets, Amount | $ 39 | $ 29 |
Fair Value, Inputs, Level 2 [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Plan Assets, Amount | 47 | 40 |
Fair Value Measured at Net Asset Value Per Share [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Plan Assets, Amount | $ 88 | $ 78 |
Equity Securities [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage | 46.00% | 42.70% |
Debt Securities [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage | 53.80% | 56.00% |
Cash and Cash Equivalents [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage | 0.20% | 1.30% |
Other Postretirement Benefits Plan [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) | $ 1 | $ 1 | $ 1
Pension Plan [Member] | UNITED STATES |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate | 5.20% | 5.25% |
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Rate of Return on Plan Assets | 6.00% | 5.37% |
Defined Benefit Plan, Benefit Obligation | $ 12 | $ 12 | 15
Defined Benefit Plan, Benefit Obligation, Foreign Currency Translation Gain (Loss) | 0 | 0 |
Defined Benefit Plan, Service Cost | 0 | 0 | 0
Defined Benefit Plan, Interest Cost | 1 | 1 | 4
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) | 0 | (1) |
Defined Benefit Plan, Benefit Obligation, Benefits Paid | (1) | (3) |
Defined Benefit Plan, Plan Assets, Amount | 9 | 8 | 9
Defined Benefit Plan, Benefit Obligations | (12) | (12) |
Defined Benefit Plan, Plan Assets, Foreign Currency Translation Gain (Loss) | 0 | 0 |
Defined Benefit Plan, Plan Assets, Increase (Decrease) for Actual Return (Loss) | 1 | 11 |
Defined Benefit Plan, Plan Assets, Contributions by Employer | 1 | (9) |
Defined Benefit Plan, Plan Assets, Benefits Paid | (1) | (3) |
Defined Benefit Plan, Funded (Unfunded) Status of Plan | (3) | (4) |
Assets for Plan Benefits, Defined Benefit Plan | 0 | 0 |
Defined Benefit Plan, Benefit Obligation, Increase (Decrease) for Plan Amendment | 0 | 0 |
Liability, Defined Benefit Plan, Current | 0 | (1) |
Liability, Defined Benefit Plan, Noncurrent | (3) | (3) |
Liability, Defined Benefit Plan | (3) | (4) |
Defined Benefit Plan, Accumulated Other Comprehensive Income (Loss), Gain (Loss), before Tax | 1 | 1 |
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, Prior Service Cost (Credit), before Tax | 0 | 0 |
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax | 1 | 1 |
Defined Benefit Plan, Expected Return (Loss) on Plan Assets | (1) | 0 | (6)
Defined Benefit Plan, Amortization of Gain (Loss) | 0 | 0 | 0
Defined Benefit Plan, Benefit Obligation, Payment for Settlement | 0 | (9) | 22
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) | 0 | (8) | 20
(Gain) loss on settlement of the Esterline Retirement Plan (the “ERP”) | $ (9) | $ (22) |
Pension Plan [Member] | Foreign Plan [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate | 4.74% | 5.56% |
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Rate of Compensation Increase | 3.24% | 3.19% |
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Rate of Return on Plan Assets | 5.42% | 5.41% |
Defined Benefit Plan, Benefit Obligation | $ 168 | $ 144 | 148
Defined Benefit Plan, Benefit Obligation, Foreign Currency Translation Gain (Loss) | 5 | 8 |
Defined Benefit Plan, Service Cost | 2 | 2 | 3
Defined Benefit Plan, Interest Cost | 8 | 7 | 4
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) | 15 | (13) |
Defined Benefit Plan, Benefit Obligation, Benefits Paid | (9) | (8) |
Defined Benefit Plan, Plan Assets, Amount | 165 | 139 | 133
Defined Benefit Plan, Benefit Obligations | (168) | (144) |
Defined Benefit Plan, Plan Assets, Foreign Currency Translation Gain (Loss) | 5 | 6 |
Defined Benefit Plan, Plan Assets, Increase (Decrease) for Actual Return (Loss) | 25 | 6 |
Defined Benefit Plan, Plan Assets, Contributions by Employer | 5 | 2 |
Defined Benefit Plan, Plan Assets, Benefits Paid | (9) | (8) |
Defined Benefit Plan, Funded (Unfunded) Status of Plan | (3) | (5) |
Assets for Plan Benefits, Defined Benefit Plan | 13 | 12 |
Defined Benefit Plan, Benefit Obligation, Increase (Decrease) for Plan Amendment | 3 | 0 |
Liability, Defined Benefit Plan, Current | 0 | 0 |
Liability, Defined Benefit Plan, Noncurrent | (16) | (17) |
Liability, Defined Benefit Plan | (3) | (5) |
Defined Benefit Plan, Accumulated Other Comprehensive Income (Loss), Gain (Loss), before Tax | (1) | 1 |
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, Prior Service Cost (Credit), before Tax | 4 | 1 |
Defined Benefit Plan, Accumulated Other Comprehensive (Income) Loss, before Tax | 3 | 2 |
Defined Benefit Plan, Expected Return (Loss) on Plan Assets | (7) | (7) | (7)
Defined Benefit Plan, Amortization of Gain (Loss) | 0 | 1 | 1
Defined Benefit Plan, Benefit Obligation, Payment for Settlement | 0 | 0 | 0
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) | $ 3 | $ 3 | $ 1

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- Definition Amount, before tax, of accumulated other comprehensive (income) loss for defined benefit plan, that has not been recognized in net periodic benefit cost (credit). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -Publisher FASB -URI https://asc.fasb.org/1943274/2147482790/220-10-45-14A Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 45 -Paragraph 10A -Subparagraph (j) -SubTopic 10 -Topic 220 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482790/220-10-45-10A Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 45 -Paragraph 10A -Subparagraph (k) -SubTopic 10 -Topic 220 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482790/220-10-45-10A Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 10A -Subparagraph (i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482790/220-10-45-10A Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (j) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
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- Definition Amount, before tax, of accumulated other comprehensive (income) loss for cost (credit) of benefit change attributable to participants' prior service from plan amendment or plan initiation of defined benefit plan, that has not been recognized in net periodic benefit cost (credit). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -Publisher FASB -URI https://asc.fasb.org/1943274/2147482790/220-10-45-14A Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (j) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
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- Definition Amount of increase (decrease) in plan assets of defined benefit plan from actual return (loss) determined by change in fair value of plan assets adjusted for contributions, benefit payments, and other expenses. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 55 -Paragraph 17 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480482/715-20-55-17 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (b)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
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- Definition Weighted average rate for present value of future retirement benefits cash flows, used to determine benefit obligation of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (k)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
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- Definition Weighted average rate of return on plan assets, reflecting average rate of earnings expected on existing plan assets and expected contributions, used to determine net periodic benefit cost of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 8 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-8 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (k)(3) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
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- Definition Amount of payment to participant of defined benefit plan which decreases benefit obligation. For pension plan, payment includes, but is not limited to, pension benefits and death benefits. For other postretirement plan, payment includes, but is not limited to, prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 60 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480266/715-60-50-4 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a)(6) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
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- Definition Amount of payment, which decreases benefit obligation of defined benefit plan, for irrevocable action relieving primary responsibility for benefit obligation and eliminating risk for obligation and assets used to effect settlement. Transaction constituting settlement includes, but is not limited to, making lump-sum cash payment to participant in exchange for their rights to receive specified benefits and purchasing nonparticipating annuity contract. Excludes decreases to benefit obligation for remeasurement due to settlement. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a)(10) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480506/715-20-50-1 + Details
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